<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%! 
String user_nam= "aa";
%>
<%
String userid =  request.getParameter("userid");
if (userid == "jack"){
	this.user_nam = "BOSS";
	} 
%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%=user_nam %>
</body>
</html>